This is a book for individuals who require to interpret data, which is surely the vast majority of us managers. We leave ourselves wide open to misjudge figures when we rely on tabulated data. The author has kept the technical side of SPC to a minimum, choosing instead to give us an insight through many and varied case studies. I thoroughly enjoyed the process of looking at the data and following logic of SPC in providing greater understanding. I enjoyed the game I played with myself of interpreting the data before Tim applied SPC logic - I was invariably wrong. Tim also had me smiling at a section on how to spot when someone is falsifying data. In the age of targets and budgets, so many of us are being forced into the skill of doctoring the figures we submit. I dream of the day when we work with undoctored information which is interpreted with real skill and we secure a deep understanding of the system in which we all work. This is an excellent book for the practical manager.